Executes orders for printing and binding placed by Congress and the departments and establishments of the Federal government. It furnishes blank paper, inks, and similar supplies to all governmental activities on order. It prepares catalogs and distributes and sells Government publications. GPO invites bids from commercial suppliers on a wide variety of printing and binding services, awards and administers contracts, and maintains liaison between ordering agencies and contractors. GPO sells through mail orders and Government bookstores approximately 10,000 publications that originate in various Government agencies, and administers the depository library program through which selected Government publications are made available in libraries throughout the country.